incline motor lubrication

I have a nordictrack 2950 commercial treadmill, there is a noise and grinding sound
When it goes up or down, I removed the main cover and there is minimal grease on the worm drive gear, it seems dry, can i use regular auto type bearing or marine grease, or do I need 100% sicone, i ordered a maintenance kit from nordictrack but it only has the silicone liquid for the running belt. Or maybe I need to replace the incline motor and gear assembly completely. Appreciate anyone's advice. Best regards


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